Condensed Matter Physics
Ultrafast carrier dynamics in 2D Perovskites
We are currently studying the photophysical and transport properties of 2D lead halide perovskites.
These systems are promising candidates as cathodes in photoelectrochemical (PEC) water-splitting cells to produce green Hydrogen (find out more about light-harvesting). Due to the quantum confinement in the single layer, excitons are the primary product of photoexcitation, together with a small number of polaronic carriers.
Results
Our aim is to unveil the presence of exciton-polaron and disclose their role in the PEC water splitting process. We exploited Ultrafast THz spectroscopy to identify the spectral fingerprint of these quasiparticles and their dynamics.
It has been possible to demonstrate the effect of the exciton polarization field on the polaronic carrier in the photoconductivity spectrum of the NBT-PbI4 sample, as reported in the Figure below.
How we study this field? Discover our Thz Beamline >
Nonlinear effect in bulk Tellurium
We are currently studying the photophysical and transport properties of 2D lead halide perovskites.
These systems are promising candidates as cathodes in photoelectrochemical (PEC) water-splitting cells to produce green Hydrogen (find out more about nanoelectronics).
Due to the quantum confinement in the single layer, excitons are the primary product of photoexcitation, together with a small number of polaronic carriers.
Results
The aim of our activity is to enhance the response of the lattice perturbation by directly exciting phonons, to induce a phase transition in Te, making the population of free carriers negligible with respect to the nonlinear modification of the Te electronic band structure.
This is possible by exploiting our strong Mid-IR ultrafast source in a degenerate HHG pump-probe fashion (HHG beamline). The light-induced phase transition is monitored by looking at the dynamics of the HHG spectrum by exploiting our EUV-Visible spectrometer.